Several parts of Delhi witnessed dense smog on Saturday morning as air quality continued to be in 'very poor' category with AQI at 355, according to Central Pollution Control Board (CPCB). Anand Vihar recorded an AQI of 403, falling in the 'severe' category, while Jahangirpuri, Rohini and Wazirpur registered AQI levels of 365, 361 and 378 respectively.